/*  FUSE: Filesystem in Userspace  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>  This program can be distributed under the terms of the GNU LGPLv2.  See the file COPYING.LIB*/#include "fuse_lowlevel.h"#include <stdio.h>#include <string.h>#include <signal.h>static struct fuse_session *fuse_instance;static void exit_handler(int sig){	(void) sig;	if (fuse_instance)		fuse_session_exit(fuse_instance);}static int set_one_signal_handler(int sig, void (*handler)(int)){	struct sigaction sa;	struct sigaction old_sa;	memset(&sa, 0, sizeof(struct sigaction));	sa.sa_handler = handler;	sigemptyset(&(sa.sa_mask));	sa.sa_flags = 0;	if (sigaction(sig, NULL, &old_sa) == -1) {		perror("fuse: cannot get old signal handler");		return -1;	}	if (old_sa.sa_handler == SIG_DFL &&	    sigaction(sig, &sa, NULL) == -1) {		perror("fuse: cannot set signal handler");		return -1;	}	return 0;}int fuse_set_signal_handlers(struct fuse_session *se){	if (set_one_signal_handler(SIGHUP, exit_handler) == -1 ||	    set_one_signal_handler(SIGINT, exit_handler) == -1 ||	    set_one_signal_handler(SIGTERM, exit_handler) == -1 ||	    set_one_signal_handler(SIGPIPE, SIG_IGN) == -1)		return -1;	fuse_instance = se;	return 0;}void fuse_remove_signal_handlers(struct fuse_session *se){	if (fuse_instance != se)		fprintf(stderr,			"fuse: fuse_remove_signal_handlers: unknown session\n");	else		fuse_instance = NULL;	set_one_signal_handler(SIGHUP, SIG_DFL);	set_one_signal_handler(SIGINT, SIG_DFL);	set_one_signal_handler(SIGTERM, SIG_DFL);	set_one_signal_handler(SIGPIPE, SIG_DFL);}